Track brake suspension



Nov. 7,-1939. E. H. PIRON TRACK BRAKE SUSPENSION Filed Aug. 21

m m E W U 2777/7 /7. P/fW/f ATTORNEY.

50 one support 4 of each pair of spring assemblies For raising andlowering the shoe 24 with the 50 Patented Nov. 7, 1939 2,178,643

UNITED STATE PATENT OFFIQE TRACK BRAKE SUSPENSION Emil H. Piron, NewYork, N. Y., assignor, by mesne assignments, to Transit ResearchCorporation, New York, N. Y., a corporation of New York ApplicationAugust 21, 1935, Serial No. 37,109 14 Claims. (Cl. 188-41) Thisinvention relates to magnetic track brakes reversed, as in those shownand described in my for rail vehicles and has for its object to provideco-pending application Serial Number 24,190, an improved suspensionmeans for the brake shoe filed May 31, 1935. The spring supports andthereof. I torque arms 8 and 9 on the two sides of the truck, 5 Aspecific object is to provide a suspension together with theirconnecting members, form 5 such that the braking forces will be resistedby a sub-frame whose distance from the rails is subshearing actionagainst two sturdy pins, the arms stantially fixed.

which transmit the forces to these pins being Fixed to or integral withthe longer arm 8 on subject to compression and tension as distineachside of the truck are bracket hangers ll and guished from bending, i2each having pins i3 and i4 carried thereby, 0

Another object is to provide a suspension with the pins being parallelwith each other and means in which the friction is reduced to a smallpreferably co-axial. Journalled on said pins I3 amount whereby theamount of elevation of the and M are bell cranks i5 and I5 respectivelyand shoes from the track will be in accurate response at the lower endof said bell cranks are clamp to the lifting forces and whereby the shoecan be openings H and i8 adapted to receive the ends 15 lowered eitherhorizontally or according to an of a shaft or tube IS. The bolts tightenthe exact predetermined angle as may be desired for clamp openings l!and it about the tube l9. reliable and efi'icient operation.Intermediate the length of the tube IQ is a Due to severe impactsreceived by track shoes sleeve 2! freely rotatable thereon and having 20during normal operation the suspension means trunnions 22 integraltherewith. These trun- 20 may become sprung or distorted in suchmannions are received by bracket members 23 fixedly ner that propersurface contact between the shoe secured to and projecting upwardly froma track and the rail is not obtained. It is therefore a brake shoe 24.Between the sleeve 2| and each further object to provide an articulatedconnecof the clamps i8 and I? are short sleeves 25 in 25 tion between abrake shoe and the suspension frictional engagement, or maintainedagainst 25 arms whereby the shoe can find its proper surrotation byfriction, with the tube I9. A rubber face contact with arail and tooppose free rocking cylinder 25 surrounds each sleeve 25 and a furof theshoe at this connection by a yielding ther cylinder 2? encircles eachrubber cylinder. means sufiiciently stifi to prevent looseness andArising from the upper surface of the shoe 24 are rattling butsufficiently resilient to provide proper additional brackets 28 forfrictional engagement 30 contact without distortion of the supportingwith the sleeves 21. The electrical parts of the mechanism. shoe 24 arenot related to the present invention Other objects and advantages willbecome and hence are not shown in the drawing. The hereinafter morefully apparent as reference is construction of a track brake shoe is oldand well had to the accompanying drawing wherein my known.

invention is illustrated by way of example and It will be seen from theforegoing that the shoe in which 213 may be raised and lowered throughthe arc Figure l is a side elevation of a truck frame of a circle sincethe pins i3 and M are fixed. taken from within the truck, It will alsobe seen that the shoe 24 may rock fore 4.0 Figures 2, 3, 4 and 5 arevertical sections taken and aft and laterally with all movements thereofalong the lines 22, 33, i6 and 5-5 respecrelative to the tube i9 beingresisted by the rubfive-1y, ber cylinders 26, and according to thefrictional l indicates a side rail having spring members contactsprovided. 2 depending therefrom for insertion through When the shoe islowered to the rail and brakcylinders 3 of rubber. Encircling eachcylinder ing is being accomp the lower m Of O e 45 3 are the externalcylindrical spring supports 4 bell crank member 15 or IE is subject totension having journals 5 fixedly carried between each and the other tocompression with the pins I 3 pair thereof. Axles ii are journalled inthe bearand i4 resisting the tension and compression in ings 5 forsupport by the wheels 7. Connecting shear.

2, 3, I; is a torque arm 8, 9 the two parts of which structure aforedescribed, a number of mechaare of unequallength and joined by anelastic nisms and devices may be found suitable. I have universalconnection 58. The other side of the found it satisfactory to place anair cylinder 29 truck is the same as just described except that on thearm 8, the piston 30 of which has a piston the relative positions of thearms 8 and 9 are rod 3| for engagement with the arm l5. Upon 5introducing compressed an and retained in I from 'uitable',

source intothe o'ylinderZS theshoe 24 is elevatedraised position untilitiisfdesired tojlower the shoe iwhereuponfthe air is released Pivotallysecured to the upper'arm1ofthe' other bell crank lBisa rod 33fonengagement with a suitable, spring} 32" abutting the arrnv 8.;

spring .32 urges the shoe rail and will therefore lend rapidityito thelower? ing "of the b shoe upon releasejof air from the 1 cy1inder'29. TI 1 b What, I claim is! b 1; The combination of a, track b'rake shoe;.-means ior supporting said shoe frorna pointima; mediatelyj above thecenter of gravity thereof, I a swiveljconnection in said "supportingmeans,"

andbm'ean's foryieldingly opposing the swivelling of said shoe aboutsaid swivel-connection.)

t b bearingsat one end and a un versal connectioni at their otherend forconnection to, a track brake shoe, said arms being adapted toj'swingthrough Y the arc of a circle with said jb'ear'n'gs asthe' ee comprisingspaced'arms I bearings at one end; a1rlgidrnemb'er,joining the nectionintermediate the ends or'samngi me I 1381: kab y upporting saidbrakeshoe there- I b g theother' ends of said arms, a sleevecarr'ied'by1 said rigid member in,rotativefengagement there with, and trunnionsprojecting from saidbsleeve s ,5. A supporting structurejr f g shoecomprising spacedarms havingjco p H bearings at heard, a rigidmemberconnecting 2. The combination of a track brakesho'eandp:

a supporting structure for saidshoe comprising 7 laterallyspacedrigidarms both pivoted'toiswing' j about fixed bearingjmenibers, HM v being carried by said arms, and a universalcone} e nection betweensaid arms and saidshoe, r

3 Asupporting structure tor a trackbrake shoe comprising spaced armshaving co-axial journal ter thereof in raising andloweringsaidshoethetrack. r p I a 4. A supportingstructurefora track brake shoe otherends of said arms,'iand a universal cone from;

for rockably supporting a brake shoe.

6. In a rail truck; the combination of a track brake having a shoeadapted to be lowered into contact with 'arail, and means for supportingsaid shoe comprising spaced arms hingedly attached at one end to theframe of the truck-with the hinges parallel to said rail and attached atthe other end to said brake shoe for lowering and raising the samethrough an arc of a circle transverse to the direction of travel of saidtruck.

7. In a rail truck, the combination of a'track brake having a brake shoeadapted to be lowered into contact with a rail, and means for supportingsaid shoe comprising spaced arms each hingedly attached "atfone end @totheyframe of f the" truck ,t With the hinges thereof parallelwith saidrail" and pivotally; attached at the ,otherfend to said sh'oje 1for3raising and: lowering the same through the arojof ajcircle transverse to the direction of travel of the truck. j a V j8;;The-combination'ofa track brake shoe, a a

a a Th downwardly toward its g I ed'with said structure' for holdingsaid shoe SUS- said brake" shoe and resilient having coeaxial journalexam supporting structure, pneumatic means associat- ,ipendedbahove thetra k, anda universal connec- "tionbetween' said supporting structureand said s'hoeifor' allowing swivelling emotion] thereof infindingfmaximum contact with'said track.

flhe combination of atrack brake shoegfa, supporting'structme; pneumaticmeans for raising 1 supporting structure; spring means for depressingsaid structure, and a universal/connection between said structure andsaid shoe whereby said shoe may swivel with respect to said istrncturein finding-maximum rail contactfl Y i 7 1,0; The"combinationy'oi1a track brake shoe, means iorsupportingsaid;shoe above the trade.ahingeiconnection between ,saidmeans and said hinge transversely f ofsaid track, 7 means: for'yieldinglyopposing the rockingof said shoeonits hinge;

shoe, with; its

a 11.- hejcombination' of a track brake shoot mcans'iorsupportingsaidshoe above, the track} :ahinge connection between said means and 'said'is 511 ith its hinge harallelwith said track,

andresilient neal'isforyieldinglyopposing the l rocking of said shoeonsaid hinge.

[12.1 The combination of a tracK brake shoe],

mes for supporting saidashoe above the track, 1 {a un ersalgconnection'betweensaidmeans and [said shoe,v and elastic] pads between' saidf shoed, said, means for yieldingiyresistingswivelling in findingloontact withJ".

movement of saidshoe;

.one end,.,a, rigid b member connecting said arms at'jtheirfotherendsajsleeverotatable on isaidf t n cmber;and having trunnions"projecting there- I from for normal position transverse tothe traclcl I,

a brake shoe journalledon said trunnions, elas b tic-pads fore andaft ofsaid trunnions residing between said member and said shoe for opposingrocking movement thereon,,and means for swinging said arms up and downabout their bearings whereby said shoe ,israised and lowered withrespect to said track,

14. A supporting structure for an elongated track brake shoe comprisingspaced two-arm 1evers extending outwardly transverse to said shoeandhaving coaxial supporting bearings, and resilient means forattachment of one-arm of each 7 Shoe.

of said levers to said brake EMIL H. PIRON.

kernechanisrn, Tparalle1 spaced xial jfixed {journal bearings at p new

